Drafting board



NOV. 19, 1929. F GlEHLER A' -l,736,342 I DRAWING BOARD lFiled April 28, 1927 Jhd Mieli ATTORNEY.

I N VEN TOR,

Patented Nov. 19, 1929 UNITED STATES PATENT OFFICE DR-AFTING BOARD Application filed April 28,

This invention relates to improvements in drafting boards and more particularly, it is designed for use by accountants for the purpose of accurately ruling sheets of paper for 5 special accounting or bookkeeping work. lt is well known that in the preparation of a set of books that many times, specially ruled sheets are required. These specially ruled sheets are then submitted to a printing and 10 ruling establishment for duplicating the same, which duplicated sheets are then either bound into a permanent binding or perforated for loose leaf accounting books. It is, therefore, very necessary that the ac- 15 countant be provided with a drafting board that particularly meets his requirements.

The invention comprises a board, to two of the adjacent right angular edges of which are secured guiding and supporting rods for two 2O ruling blades for drawing lines at right angles to each other. These blades are graduated into suitable divisions as sixteenths or tenths. The two adjacent edges of the board are each M formed with a depression which is slightly t" greater in depth than the thickness of the ruling blades. These depressions are also for the purpose of receiving the blade that is not in use for ruling purposes and,`for permitting the other blade to pass freely over m 'the blade that is in the depression and over the upper surface of the board.A The blade that is in the depression affords a means of accurately positioning the movable blade with relation to the graduations of the fixed blade.

l' The depressions also afford a suitable means ofretaining the blades when not in use.

The invention further comprises means for rigidly retaining the blades securely in place 4o on the supporting rods whiler in use, that is to say, the outer or free ends of the blades are efect-ually prevented from being accidentally displaced or moved out of their ruling position, whereby the lines ruled on the sheet of l5 paper will be exactly'parallelto each other.

Referring to the drawings:

Fig. 1 is a plan view of the complete board showing the two parallel blade supporting and guiding rods that are attached to two 'of '50 Vthe adjacent right angular edges ofthe board,

1927. Serial No. 187,216.

and twoy ruling blades that are movable on these rods.

Fig. 2 is a detail sectional view on the sectional lines 2--2 of Fig. 1, showing the depression in one of the edges or" the board with f one blade therein, and the other blade located over the first blade, and illustrating the two supporting and guiding rods for the upper blade.

Fig. 3 is a view on the line 3 3 lof Fig. 1 showing one of the iron plates that is secured to the two adjacent edges of the board.

Fig. 4 is a sectional view on the line 4 4 of Fig. 1 showing a blade in a depression, and the eccentrically` shaped part of the guide rods at one end.

Fig. 5 is a perspecti've'view of the eccentric end of one of the guide rods.

Referring to the drawings in detail:

1 designates the board as a whole and 2 and 3 are two depressions in the adjacent right angular edges of the board, which depressions are slightly greater in depth than the thickness of the two ruling blades 4 and 5 and of a width equal to the width of the ruling blades. k6 designates an iron plate that is secured to the left hand edge or end of the board 1 by means of the screws indicated at 7. 8 designates an iron plate that is secured to the upper or adjacent edge of the board. The upper edges of these iron plates are usli with-the bottom surfaces of the depressions 2 and 3 as indicated in Figs. 2 and 4 at 9. The iron plates 6 and 8 are each notched one half of their depth in order that they may fit together as indicated in Fig. 1 at 10. 11 and 12 designate two guiding and supporting rods for the graduated ruling blade 5. These rods are suitably secured to one end of theplate 8 and to one end of the short plate 13 that is attached to the board'. 14 and 15 are another pair of guiding and supporting rods for the ruling blade 4, which rods are secured to one end of the plate 6'and to one end of the short plate 16 that is secured to the board. The ends of the rods 11 and 12 opposite the depression 3 are formed with an eccentric portion 16 and 17 and the ends of the rods 14 and 15 are also formed with an eccentric portion 1.8 and 19, see Fig. 4. These eccentric or reduced portions are shown in detail in Fig. 4. The circular portion of these rods is indicated by the dotted lines 20 and 21 and the reduced portion by the full lines 18 and 19. The purpose of these reduced portions is to permit the blades 4 and 5 to drop and enter the depressions or cut away portions 2 and 3 where by the upper surface of t-hese blades will be slightly below the upper surface of the board 1. They also serve the additional purpose of preventing the blades from becoming displaced from these depressions.

24 and 25 are blade guiding and support ing blocks to which the blades 4 and 5 are secured as indicated by the screws 26. These blocks are each formed with a circular opening 27 for receiving the rods 11 and 14 rcsaectively. They are each formed with a channel or curved shaped recess part 2S, which part is designed to engage the rods 12 and 15y respectively, when the blades are in the positions shown in Figs. 1, 2, and 4.

An important feature f the present in? vention is that the distance from the center of the opening 27 to the center of the recess 28 is less than the distance from the centers `of the rods 11 and 12 and also the centers of the rods 14 and 15. This shorter distance is represented by the dotted lines 29, see A ig. 2. The purpose of this construction is that when the guide block 24 is moved downward into the full'line position the recess 28 will firmly clamp or engage the inner rods 12 and l 15, whereby all lost motion of the blades 4 and is reduced and the outer ends of these blades will be accurately retained in their ruling position.

Thedevice is used as follows: vWhen it is desired to produce horizontal lines by means of the blade 5, the blade 4 is in the position shown in the recess 2 of Fig. 1. The blade 4 is turned into the dotted position shown in Fig. 2. This permits the guide block 24 to be freely moved along on the rod 11. lVhen the desired position is determined, with reference to the graduations on the blade 4, it is then pushed down tightly onto the rod 12. If it 'is desired to accurately rule vertical lines, the blade 5 is placed in the recess 3 which would bring it below the upper surface of the board, the blade 4 is then removed by swinging it upward in the saine manner as shown in Fig. 2, thus freeing it from the re- 2 cessed ends 18 and 19 of the rods 14 and 15.

The blade 4 may then be accurately positioned with reference to the graduations of the blade 5 and the vertical lines drawn on the paper to be ruled.

It is, of course, importa-nt that the edge 5 of the blade 5 and the edge 2 of the blade -2 be accurately positioned with reference to the graduations of the other blade.

The eccentric ends 18 and 19 of the rods 14 and 15, and the eccentric ends 16 and 17 of the rods 11 and 12 permit the blades 4 and 5 to drop downward and enter the de pressions 2 and 3.

What I claim is:

1. In a drafting board a board having straight edges, plates secured to two of its adjacent edges, a plurality of guide rods parallelly arranged to said adjacent edges, means for securing the guide rods to the said plates, ruling blades, guide blocks to which the blades are attached, each block having an openingto receive one of the guide rods and a recess on the lower side spaced from the open ing therein to receive another guide rod, whereby each of the blades is separately and pivotally movable onto and away from the board.

2, In a drafting board a board having straight edges, plates secured to two of its adjacent edges, a plurality of guide rods parallelly arranged to said adjacent edges, means for securing the guide rods to the said plates, two ruling blades, guide blocks to which the blades are attached, the guide blocks each having an opening to receive one of the parallelly arranged guide rods and a recess in their lower surfaces and spaced from the opening to receive another parallel guide rod, whereby each of the blades are independently and pivotally movable onto and away from the drafting board, the distance between the opening and said spaced recess of each block being less than the distances between the parallel guide rods, for producing a binding or friction effect between the said rods and blocks for retaining the blades against lateral displacement when moved downward on to the drafting board.

3. In a drafting board having two adjacent straight edges, ruling blades attached to the said board at each of the two adjacent straight edges, the upper surface of the drafting board adjacent the straight edges' being formed with a blade receiving depression, a pair of parallel guide rods secured to each of the adjacent straight edges of the board that are formed with the depression, the adjacent end portions of the guide rods opposite the depressions being reduced or partially cut away, ablock slidably and pivotally mounted on each of the parallel guide rods, a ruling blade secured to said blocks, the reduced or partial- 1y cut away portion of the rods opposite the depression permits either one of the blades to be placed in a depression and the other Vblade in the other or adjacent depression, and the blade that is not placed in a depression may be moved along on its rod and over the other blade that is located in a depression, and frictional means between the blocks and guide rods for retaining eachblade against lateral movement on the rods, whereby the ruled lines may always be parallel to each other.

4. In a .drafting board for ruling accountants sheets, a board having adjacent straight edges, two ruling blades, means for slidably and pivotally securing the ruling blades to the adjacent straight edges of the board, the adjacent edge surfaces of the board having blade receiving depressions in which a blade is placed, said blade securing means permitting either one of the ruling blades to be movable over the othei ruling blade, and friction means for retaining the-movable blade againstlateral movement on the said blade securing means.

5. A drafting board, a board having adjacent straight edges, plates secured to its straight edges the board being formed with depressions in its upper surface adjacent the straight edges, the upper edges of the plates being `liush with the upper surfaces of the depressions, one of the ends of each ot' the plates extending beyond the adjacent edges of the board and each plate having a notch to permit the plates to cross each other and be locked together, guide rods secured at one of their ends to the extended ends or the plates, other plates secured to the board and to which the other ends oi' the guide rods are secured, ruling blades, blocks to which the ruling blades are secured, the blocks each having an opening in which one of the guide rods is pivotally and slidably located, and, each block having a depression in its lower surface to receive another guide rod, the distance between the aXis of the guide rods being greater than the distance between the opening and the depression in the guide blocks to cause the blocks to bind on the rods and rictionally prevent lateral movement ot the ruling blades, the ends ot the rods being reduced or partially cut away opposite the depressions in the blocks to cause the blades to enter the depressions.

6. A block for attaching a drawing board ruling blade to a drawing board having two rods attached to an edge of the board, said block comprising a member having an opening to receive one of the rods, and a depression in its under surface to receive the other rod when the ruling blade is rotated on vthe rod on the board, the opening being to pivotally connect the ruling blades to the rod and the depression being to receive the second or other rod which is attached to the board, the distance between the rods being slightly greater than the distance between the opening and the depression for causing the block to 'rictionally bind on the rods and thus retain the ruling blade against lat-eral movement when in use.

7. A block for pivotally attaching a ruling blade to a drawing board having two rods spaced from each other and secured to an edge of the drawing board and to which bloclt the ruling blade is secured, said block comprising a member that is formed with an opening through the same to receive one of the rods,

and a depression in its under side that is parallel to the opening for receiving the other rod.

8. In a drawing board, rods attached to two of its adjacent edges, each of the rods having an end portion that is reduced or cut away, the board having depressions in its adjacent edge ysurfaces and ,terminating opposite the reduced portions of the rods, guide blocks on the rods, graduated ruling blades secured to the guide blocks, whereby when the guide blocks are located on the reduced portions of the rods, the graduated ruling` blades will enter the depressions in the board, and, when the guide blocks are not located on the reduced portions of the rods one of the graduated ruling blades may be moved along the upper surface of the board and over the other graduated blade which is in a depression. Jfor the purpose of utilizing the graduations of the blade in the depression, the depression further serving the purpose oit' presenting the upper surface ot a blade that is flush with the upper surface of the board.

9. In a drawing board, a board having ac .jacent straight edges, blade receiving depressions 'formed in its adjacent edge surfaces, rods attached to the adjacent edges, the rods having reduced portions opposite the ends of he depressions, guide blocks on the rods, blades attached to the blocks, the reduced portions oi the rods serving to cause the blades to enter the depressions whereby one blade may be moved over the other to cause the movable blaee to lie flat on the board.

FRED GIEHLER.

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